Beat the butter and sugar with an electric whisk until well combined. Whisk in the vanilla, then add the milk a splash at a time, alternating with spoonfuls of the flour. Fold in any remaining flour, the baking powder and a pinch of salt until you get a creamy batter. Don’t worry if it looks a little curdled at this stage.
Healthy chocolate brownies
Heat the oven to 190C/170C fan/gas 5 and line a shallow 23cm square baking tin with baking parchment. Tip the beans, cocoa, coffee granules, xylitol, vanilla, eggs and yogurt into a large bowl. Blitz using a hand blender until smooth. Or, do this in a food processor. Add the baking powder, then blitz again.